Oral submucous fibrosis is known to progress even after habit cessation and that is in keeping with organ fibrosis in any other part of the body.
But, can it be initiated after the habit cessation. My experience and understanding of the disease leads me to think that such disease inititaion can not be possible, since the process is caused by unresolved, repeated trauma to the tissue. which will be resolved by habit cessation if the fibrosis has not occured as yet.